/*
  settings.c - eeprom configuration handling 
  Part of Grbl

  Copyright (c) 2009-2011 Simen Svale Skogsrud

  Grbl is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  Grbl is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <math.h>
#include <stdbool.h>
#include "types.h"
#include "protocol.h"
#include "report.h"
#include "stepper.h"
#include "nuts_bolts.h"
#include "settings.h"
#include "eeprom.h"
#include "limits.h"

settings_t settings;

// declarations
uint8_t read_global_settings(void);



// Method to store startup lines into EEPROM
void settings_store_startup_line(uint8_t n, char *line)
{
  uint16_t addr = n*(LINE_BUFFER_SIZE+1)+EEPROM_ADDR_STARTUP_BLOCK;
  memcpy_to_eeprom_with_checksum(addr,(char*)line, LINE_BUFFER_SIZE);
}

// Method to store coord data parameters into EEPROM
void settings_write_coord_data(uint8_t coord_select, float *coord_data)
{  
  uint16_t addr = coord_select*(sizeof(float)*N_AXIS+1) + EEPROM_ADDR_PARAMETERS;
  memcpy_to_eeprom_with_checksum(addr,(char*)coord_data, sizeof(float)*N_AXIS);
}  

// Method to store Grbl global settings struct and version number into EEPROM
void write_global_settings(void) 
{
  eeprom_put_char(0, SETTINGS_VERSION);
  memcpy_to_eeprom_with_checksum(EEPROM_ADDR_GLOBAL, (char*)&settings, sizeof(settings_t));
}

// Method to reset Grbl global settings back to defaults. 
void settings_reset(bool reset_all) {
  // Reset all settings or only the migration settings to the new version.
  if (reset_all) {
    settings.steps_per_mm[X_AXIS] = DEFAULT_X_STEPS_PER_MM;
    settings.steps_per_mm[Y_AXIS] = DEFAULT_Y_STEPS_PER_MM;
    settings.steps_per_mm[Z_AXIS] = DEFAULT_Z_STEPS_PER_MM;
    settings.pulse_microseconds = DEFAULT_STEP_PULSE_MICROSECONDS;
    settings.default_feed_rate = DEFAULT_FEEDRATE;
    settings.default_seek_rate = DEFAULT_RAPID_FEEDRATE;
    settings.acceleration = DEFAULT_ACCELERATION;
    settings.mm_per_arc_segment = DEFAULT_MM_PER_ARC_SEGMENT;
    settings.invert_mask = DEFAULT_STEPPING_INVERT_MASK;
    settings.junction_deviation = DEFAULT_JUNCTION_DEVIATION;
  }
  // New settings since last version
  settings.flags = 0;
  if (DEFAULT_REPORT_INCHES) { settings.flags |= BITFLAG_REPORT_INCHES; }
  if (DEFAULT_AUTO_START) { settings.flags |= BITFLAG_AUTO_START; }
  if (DEFAULT_INVERT_ST_ENABLE) { settings.flags |= BITFLAG_INVERT_ST_ENABLE; }
  if (DEFAULT_HARD_LIMIT_ENABLE) { settings.flags |= BITFLAG_HARD_LIMIT_ENABLE; }
  if (DEFAULT_HOMING_ENABLE) { settings.flags |= BITFLAG_HOMING_ENABLE; }
  settings.homing_dir_mask = DEFAULT_HOMING_DIR_MASK;
  settings.homing_feed_rate = DEFAULT_HOMING_FEEDRATE;
  settings.homing_seek_rate = DEFAULT_HOMING_RAPID_FEEDRATE;
  settings.homing_debounce_delay = DEFAULT_HOMING_DEBOUNCE_DELAY;
  settings.homing_pulloff = DEFAULT_HOMING_PULLOFF;
  settings.stepper_idle_lock_time = DEFAULT_STEPPER_IDLE_LOCK_TIME;
  settings.decimal_places = DEFAULT_DECIMAL_PLACES;
  settings.n_arc_correction = DEFAULT_N_ARC_CORRECTION;
  write_global_settings();
}

// Reads startup line from EEPROM. Updated pointed line string data.
uint8_t settings_read_startup_line(uint8_t n, char *line)
{
	uint16_t addr = n*(LINE_BUFFER_SIZE+1)+EEPROM_ADDR_STARTUP_BLOCK;
 
	if (!(memcpy_from_eeprom_with_checksum((char*)line, addr, LINE_BUFFER_SIZE))) 
	{
		// Reset line with default value
		line[0] = 0;
		settings_store_startup_line(n, line);
		return(false);
	} else 
	{
		return(true);
	}
}

// Read selected coordinate data from EEPROM. Updates pointed coord_data value.
uint8_t settings_read_coord_data(uint8_t coord_select, float *coord_data)
{
  uint16_t addr = coord_select*(sizeof(float)*N_AXIS+1) + EEPROM_ADDR_PARAMETERS; 
  if (!(memcpy_from_eeprom_with_checksum((char*)coord_data, addr, sizeof(float)*N_AXIS))) {
    // Reset with default zero vector
    clear_vector_float(coord_data); 
    settings_write_coord_data(coord_select,coord_data);
    return(false);
  } else {
    return(true);
  }
}  

// Reads Grbl global settings struct from EEPROM.
uint8_t read_global_settings(void) 
{
	// Check version-byte of eeprom
	uint8_t version = eeprom_get_char(0);
  
	if (version == SETTINGS_VERSION) 
	{
		// Read settings-record and check checksum
		if (!(memcpy_from_eeprom_with_checksum((char*)&settings, EEPROM_ADDR_GLOBAL, sizeof(settings_t))))
		{
			return(false);
		}
	}
	else
	{
		return(false);
	}
	
	return(true);
}


// A helper method to set settings from command line
uint8_t settings_store_global_setting(int parameter, float value) {
  switch(parameter) {
    case 0: case 1: case 2:
      if (value <= 0.0) { return(STATUS_SETTING_VALUE_NEG); } 
      settings.steps_per_mm[parameter] = value; break;
    case 3: 
      if (value < 3) { return(STATUS_SETTING_STEP_PULSE_MIN); }
      settings.pulse_microseconds = round(value); break;
    case 4: settings.default_feed_rate = value; break;
    case 5: settings.default_seek_rate = value; break;
    case 6: settings.invert_mask = trunc(value); break;
    case 7: settings.stepper_idle_lock_time = round(value); break;
    case 8: settings.acceleration = value*60*60; break; // Convert to mm/min^2 for grbl internal use.
    case 9: settings.junction_deviation = fabs(value); break;
    case 10: settings.mm_per_arc_segment = value; break;
    case 11: settings.n_arc_correction = round(value); break;
    case 12: settings.decimal_places = round(value); break;
    case 13:
      if (value) { settings.flags |= BITFLAG_REPORT_INCHES; }
      else { settings.flags &= ~BITFLAG_REPORT_INCHES; }
      break;
    case 14: // Reset to ensure change. Immediate re-init may cause problems.
      if (value) { settings.flags |= BITFLAG_AUTO_START; }
      else { settings.flags &= ~BITFLAG_AUTO_START; }
      break;
    case 15: // Reset to ensure change. Immediate re-init may cause problems.
      if (value) { settings.flags |= BITFLAG_INVERT_ST_ENABLE; }
      else { settings.flags &= ~BITFLAG_INVERT_ST_ENABLE; }
      break;
    case 16:
      if (value) { settings.flags |= BITFLAG_HARD_LIMIT_ENABLE; }
      else { settings.flags &= ~BITFLAG_HARD_LIMIT_ENABLE; }
      limits_init(); // Re-init to immediately change. NOTE: Nice to have but could be problematic later.
      break;
    case 17:
      if (value) { settings.flags |= BITFLAG_HOMING_ENABLE; }
      else { settings.flags &= ~BITFLAG_HOMING_ENABLE; }
      break;
    case 18: settings.homing_dir_mask = trunc(value); break;
    case 19: settings.homing_feed_rate = value; break;
    case 20: settings.homing_seek_rate = value; break;
    case 21: settings.homing_debounce_delay = round(value); break;
    case 22: settings.homing_pulloff = value; break;
    default: 
      return(STATUS_INVALID_STATEMENT);
  }
  write_global_settings();
  return(STATUS_OK);
}

// Initialize the config subsystem
void settings_init(void) 
{
	if (!read_global_settings()) 
	{
		report_status_message(STATUS_SETTING_READ_FAIL);
		settings_reset(true);
		report_grbl_settings();
	}
	
	// Read all parameter data into a dummy variable. If error, reset to zero, otherwise do nothing.
	float coord_data[N_AXIS];
	uint8_t i;
	for (i=0; i<=SETTING_INDEX_NCOORD; i++) 
	{
		if (!settings_read_coord_data(i, coord_data)) 
		{
			report_status_message(STATUS_SETTING_READ_FAIL);
		}
	}
	// NOTE: Startup lines are handled and called by main.c at the end of initialization.
}
